Like ED said, I would recommend changing the PSU to a lower watt but higher quality unit. It is a foundational component and you don't want to cheap on it. The Corsair CX series is serviceable but you can do better for approximately the same amount of money since you don't need nearly 750 watts.
Another recommendation I have is changing the 1TB spinner hard drive for a smaller SSD, at least if you don't need a lot of storage space. Truth be told, most people don't come close to using 1 TB of storage space. There are exceptions of course, particularly those who archive a lot of pictures and music. But an SSD will give your computer a performance shot in the arm in everyday computing like nothing else. The computer will boot and load programs in a fraction of the time it would when using a spinner hard drive. Look at changing that spinner hard drive for a 240-256gb SSD.
Finally, you have no video card listed. Will the games you list run acceptably on the processor's built-in GPU? I'm not a gamer so maybe some other forum members can chime in here.